The equivalent expression for (1.2³ / 1.3⁴)⁻⁷ is ( 1.3⁴/1.2³)⁷

Equivalent expressions can be defined as expressions that are the same, even though they may look a little different.

If you substitute  the same variable value into equivalent expressions, they will each give you the same value when you simplify

1.2 cubed over 1.3 raised to the fourth power all raised to the power of negative seven can be written as:

(1.2³ / 1.3⁴)⁻⁷

To can write an equivalent expression for (1.2³ / 1.3⁴)⁻⁷ by interchanging the numerator and denominator and then changing the negative power to positive:

(1.2³ / 1.3⁴)⁻⁷ = ( 1.3⁴/1.2³)⁷

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